284 
each palatine bone; the palatine patches divergent behind. 
Bluish green above, margaritaceous or silvery below. Fins 
yellowish, more or less dusky. Length of the two known 
specimens 100 and 113 mm. [After Bleeker and Giinther, not 
seen by us]. 
Habitat: Sumatra (Priaman, Trussan, Benkulen). 
In sea and estuaries. 
7. Arius maculatus (Thunb.) '). 
Silurus maculatus Thunberg, Kongl. Vetensk, Acad. Nya Handling. XIII. Stock- 
holm, 1792, p. 31. 
Arius gagoroides Bleeker, Nat. & Geneesk. Arch. Ned. Ind. III (2). 1846, p. 168. 
Arius Heckelii Bleeker, Nat. & Geneesk. Arch. Ned. Ind. II (2). 1846, p. 169. 
Arius pidada Bleeker, Nat. & Geneesk. Arch. Ned. Ind. III (2). 1846, p. 169. 
Arius angulatus Bleeker, Nat. & Geneesk. Arch. Ned. Ind. III (2). 1846, p. 170. 
Arius chondropterygioides Bleeker, Nat. & Geneesk. Arch. Ned. Ind. III (2). 
1846, p. 170. ; 
Arius viviparus Bleeker, Nat. & Geneesk. Arch. Ned. Ind. III (2). 1846, p. 171. 
Arius borneensis Bleeker, Nat. Tijdschr. Ned. Ind. II. 1851, p. 67. 
Arius arvius Bleeker, Ichth. Arch. Ind. Prodr. I. Siluri, 1858. p. 73. 
Arius pidada Bleeker, Ichth. Arch. Ind. Prodr. I. Siluri, 1858, p. 74. 
Pseudarius arius Bleeker, Atl. Ichth. 1]. 1862, p. 36. 
Arius maculatus Ginther, Cat. Brit. Mus. V. 1864, p. 166. 
Arius maculatus Kner, Novara-Exp. Fische, 1865—1867, p. 311. 
B53 Do Gy As io—-226) Pi) 10 —— ie OW, oO. 
Elongate, height 4—5, head 3?/,—4, somewhat broader than 
high, its width at least equal to head without snout. Head- 
shields granular and rugose, occipital process carinate, granulated, 
scarcely longer than broad and more or less triangular, the 
truncate hindborder touches the semicircular granulate basal 
bone of the dorsal spine. Median fontanel rather broad, be- 
ginning at the snout, narrowing behind and ending before 
occipital process. Humeral process triangular, granulated. Dorsal 
profile sloping down in a straight or slightly convex line to 
the bluntly rounded, slightly prominent snout. Eye 5'/, (in 
spec. of 330 mm.) with a free orbital margin, more than half 
length of snout and more than twice in the interorbital space. 
Maxillary barbels reaching on pectorals, in older specimens 
1) We have no material to decide the question if Pimelodus arius H.B., 
Arius arius C.V. and Arius Buchanani Day from the Asiatic continent, belong 
to this species, 
